common/image-android.c

   1 /*
   2  * Copyright (c) 2011 Sebastian Andrzej Siewior <bigeasy@linutronix.de>
   3  *
   4  * SPDX-License-Identifier:     GPL-2.0+
   5  */
   6
   7 #include <common.h>
   8 #include <image.h>
   9 #include <android_image.h>
  10 #include <malloc.h>
  11 #include <errno.h>
  12
  13 #define ANDROID_IMAGE_DEFAULT_KERNEL_ADDR       0x10008000
  14
  15 static char andr_tmp_str[ANDR_BOOT_ARGS_SIZE + 1];
  16
  17 static ulong android_image_get_kernel_addr(const struct andr_img_hdr *hdr)
  18 {
  19         /*
  20          * All the Android tools that generate a boot.img use this
  21          * address as the default.
  22          *
  23          * Even though it doesn't really make a lot of sense, and it
  24          * might be valid on some platforms, we treat that adress as
  25          * the default value for this field, and try to execute the
  26          * kernel in place in such a case.
  27          *
  28          * Otherwise, we will return the actual value set by the user.
  29          */
  30         if (hdr->kernel_addr == ANDROID_IMAGE_DEFAULT_KERNEL_ADDR)
  31                 return (ulong)hdr + hdr->page_size;
  32
  33         return hdr->kernel_addr;
  34 }
  35
  36 /**
  37  * android_image_get_kernel() - processes kernel part of Android boot images
  38  * @hdr:        Pointer to image header, which is at the start
  39  *                      of the image.
  40  * @verify:     Checksum verification flag. Currently unimplemented.
  41  * @os_data:    Pointer to a ulong variable, will hold os data start
  42  *                      address.
  43  * @os_len:     Pointer to a ulong variable, will hold os data length.
  44  *
  45  * This function returns the os image's start address and length. Also,
  46  * it appends the kernel command line to the bootargs env variable.
  47  *
  48  * Return: Zero, os start address and length on success,
  49  *              otherwise on failure.
  50  */
  51 int android_image_get_kernel(const struct andr_img_hdr *hdr, int verify,
  52                              ulong *os_data, ulong *os_len)
  53 {
  54         u32 kernel_addr = android_image_get_kernel_addr(hdr);
  55
  56         /*
  57          * Not all Android tools use the id field for signing the image with
  58          * sha1 (or anything) so we don't check it. It is not obvious that the
  59          * string is null terminated so we take care of this.
  60          */
  61         strncpy(andr_tmp_str, hdr->name, ANDR_BOOT_NAME_SIZE);
  62         andr_tmp_str[ANDR_BOOT_NAME_SIZE] = '\0';
  63         if (strlen(andr_tmp_str))
  64                 printf("Android's image name: %s\n", andr_tmp_str);
  65
  66         printf("Kernel load addr 0x%08x size %u KiB\n",
  67                kernel_addr, DIV_ROUND_UP(hdr->kernel_size, 1024));
  68
  69         int len = 0;
  70         if (*hdr->cmdline) {
  71                 printf("Kernel command line: %s\n", hdr->cmdline);
  72                 len += strlen(hdr->cmdline);
  73         }
  74
  75         char *bootargs = env_get("bootargs");
  76         if (bootargs)
  77                 len += strlen(bootargs);
  78
  79         char *newbootargs = malloc(len + 2);
  80         if (!newbootargs) {
  81                 puts("Error: malloc in android_image_get_kernel failed!\n");
  82                 return -ENOMEM;
  83         }
  84         *newbootargs = '\0';
  85
  86         if (bootargs) {
  87                 strcpy(newbootargs, bootargs);
  88                 strcat(newbootargs, " ");
  89         }
  90         if (*hdr->cmdline)
  91                 strcat(newbootargs, hdr->cmdline);
  92
  93         env_set("bootargs", newbootargs);
  94
  95         if (os_data) {
  96                 *os_data = (ulong)hdr;
  97                 *os_data += hdr->page_size;
  98         }
  99         if (os_len)
 100                 *os_len = hdr->kernel_size;
 101         return 0;
 102 }
 103
 104 int android_image_check_header(const struct andr_img_hdr *hdr)
 105 {
 106         return memcmp(ANDR_BOOT_MAGIC, hdr->magic, ANDR_BOOT_MAGIC_SIZE);
 107 }
 108
 109 ulong android_image_get_end(const struct andr_img_hdr *hdr)
 110 {
 111         ulong end;
 112         /*
 113          * The header takes a full page, the remaining components are aligned
 114          * on page boundary
 115          */
 116         end = (ulong)hdr;
 117         end += hdr->page_size;
 118         end += ALIGN(hdr->kernel_size, hdr->page_size);
 119         end += ALIGN(hdr->ramdisk_size, hdr->page_size);
 120         end += ALIGN(hdr->second_size, hdr->page_size);
 121
 122         return end;
 123 }
 124
 125 ulong android_image_get_kload(const struct andr_img_hdr *hdr)
 126 {
 127         return android_image_get_kernel_addr(hdr);
 128 }
 129
 130 int android_image_get_ramdisk(const struct andr_img_hdr *hdr,
 131                               ulong *rd_data, ulong *rd_len)
 132 {
 133         if (!hdr->ramdisk_size) {
 134                 *rd_data = *rd_len = 0;
 135                 return -1;
 136         }
 137
 138         printf("RAM disk load addr 0x%08x size %u KiB\n",
 139                hdr->ramdisk_addr, DIV_ROUND_UP(hdr->ramdisk_size, 1024));
 140
 141         *rd_data = (unsigned long)hdr;
 142         *rd_data += hdr->page_size;
 143         *rd_data += ALIGN(hdr->kernel_size, hdr->page_size);
 144
 145         *rd_len = hdr->ramdisk_size;
 146         return 0;
 147 }
 148
 149 int android_image_get_second(const struct andr_img_hdr *hdr,
 150                               ulong *second_data, ulong *second_len)
 151 {
 152         if (!hdr->second_size) {
 153                 *second_data = *second_len = 0;
 154                 return -1;
 155         }
 156
 157         *second_data = (unsigned long)hdr;
 158         *second_data += hdr->page_size;
 159         *second_data += ALIGN(hdr->kernel_size, hdr->page_size);
 160         *second_data += ALIGN(hdr->ramdisk_size, hdr->page_size);
 161
 162         printf("second address is 0x%lx\n",*second_data);
 163
 164         *second_len = hdr->second_size;
 165         return 0;
 166 }
 167
 168 #if !defined(CONFIG_SPL_BUILD)
 169 /**
 170  * android_print_contents - prints out the contents of the Android format image
 171  * @hdr: pointer to the Android format image header
 172  *
 173  * android_print_contents() formats a multi line Android image contents
 174  * description.
 175  * The routine prints out Android image properties
 176  *
 177  * returns:
 178  *     no returned results
 179  */
 180 void android_print_contents(const struct andr_img_hdr *hdr)
 181 {
 182         const char * const p = IMAGE_INDENT_STRING;
 183         /* os_version = ver << 11 | lvl */
 184         u32 os_ver = hdr->os_version >> 11;
 185         u32 os_lvl = hdr->os_version & ((1U << 11) - 1);
 186
 187         printf("%skernel size:      %x\n", p, hdr->kernel_size);
 188         printf("%skernel address:   %x\n", p, hdr->kernel_addr);
 189         printf("%sramdisk size:     %x\n", p, hdr->ramdisk_size);
 190         printf("%sramdisk addrress: %x\n", p, hdr->ramdisk_addr);
 191         printf("%ssecond size:      %x\n", p, hdr->second_size);
 192         printf("%ssecond address:   %x\n", p, hdr->second_addr);
 193         printf("%stags address:     %x\n", p, hdr->tags_addr);
 194         printf("%spage size:        %x\n", p, hdr->page_size);
 195         /* ver = A << 14 | B << 7 | C         (7 bits for each of A, B, C)
 196          * lvl = ((Y - 2000) & 127) << 4 | M  (7 bits for Y, 4 bits for M) */
 197         printf("%sos_version:       %x (ver: %u.%u.%u, level: %u.%u)\n",
 198                p, hdr->os_version,
 199                (os_ver >> 7) & 0x7F, (os_ver >> 14) & 0x7F, os_ver & 0x7F,
 200                (os_lvl >> 4) + 2000, os_lvl & 0x0F);
 201         printf("%sname:             %s\n", p, hdr->name);
 202         printf("%scmdline:          %s\n", p, hdr->cmdline);
 203 }
 204 #endif